'That '70s Show' actress Lisa Robin Kelly dies

Actress Lisa Robin Kelly, who was known to most people as the promiscuous older sister on the Fox sitcom "That '70s Show," has died at age 43.

Kelly's agent, Craig Wyckoff, confirmed her death, saying that the actress had been dealing with her troubles with addiction at the time of her death, and had voluntarily checked into a California rehab facility on Monday. She apparently died in her sleep sometime Wednesday night.

"I spoke to her on Monday and she was hopeful and confident, looking forward to putting this part of her life behind her," Wyckoff said in a statement. "Last night she lost the battle. Cause of death has not been issued yet and no death certificate has been issued either."

Kelly's acting career never reached the heights of her fellow "'70s Show" costars Ashton Kutcher, Mila Kunis and Topher Grace. In recent years, she'd had several run-ins with law enforcement, most recently an arrest in June on suspicion of DUI after her car stalled on the 5 Freeway in Burbank.

Kelly and her husband, Robert Joseph Gilliam, were also arrested last November after police were called to their home in Mooresville, N.C., after reports of a domestic disturbance. In June of this year, two weeks after the suspected DUI arrest, Kelly filed for divorce from Gilliam.

Kelly's drinking problems began in 2003, following a miscarriage. The drinking eventually led to her departure from the series. She told ABC News in 2012, "I had lost a baby. As a result of that I lost everything and I was abusing alcohol."